Page 4 - BWI-Commercial-Interactive-brochure
P. 4


Fire Ratings and Applications.

   Fire doors and their respective frames and hardware are rated by the amount of time, in minutes or
   hours, that a door can withstand the heat and pressure of a fire in test conditions.

   Laws and regulations can vary greatly between states, cities, townships and
   municipalities. We reccomend that you check with all regulating authorities to
   ensure the door units you order and install comply with all applicable laws.

   Positive Pressure (UL 10c) Fire Doors

   The WDMA (Window and Door Manufacturers Association) separates positive pressure fire-rated doors

   into two categories. Both Category “A” and Category “B” doors make use of intumescent seals. These

   materials expand when heated, creating a tight seal and filling in gaps around the door. This expansion

   helps prevent the spread of fire and super-heated gasses from escaping the opening.

   Category “A”- Wood Doors

   Category “A” doors have intumescent seals and/or gasketing built into the structure of the door.

   Although typically they do not require additional sealing between the door and frame in some cases

   they may require a smoke seal or additional gaskets.

   Category “B”- Wood or Hollow Metal Doors

   Category “B” doors are neutral pressure doors that require an additional intumescent strip and/or gasket

   kit applied to the frame to provide an intumescent seal. Because fire regulations can vary greatly, some

   areas will also require an intumescent strip as part of the door’s edge. Please discuss your needs with

   your BWI Commercial Representave and we will be happy to add these additonal gaskets and or

   intumescent strips to your order. They can be applied according to the enclosed instructions by the

   installer in the field.

   Smoke Seal Labels

   Some doors, regardless of pressure requirements, may also require a smoke seal (‘’S”) label. This label

   indicates that the installer is required to apply a category “H” gasket to the frame. If you are in need of a

   (“S”) label let your BWI Commercial representative know and we’ll get you what you need.


   Fire doors must self-close and latch. This is accomplished using a door closer or self-closing hinges.

   Not a problem, we’ve got you covered. See page 8 and 9 for our hardware offerings.


   Fire doors must have a labeled automatic latching device to engage the strike. Locksets with a latch bolt

   or a panic device with a latch bolt are required. Deadbolts can’t be used in place of a latch bolt, but can

   be used to add additional security to an opening with a latch bolt, except on egress doors.

   Door Unit vs Wall Fire Ratings

   Commercial codes typically require that door units be rated for three-fourths of the rating of the sur-

   rounding wall. So if you have a 4 hour rated wall use a 3 hour rated door; a 2 hour rated wall use a 90

   minute rated door; and a 1 hour rated wall use a 45 minute rated door.

   Adding a Lite to a Fire-Rated Door

   Vision lites can be added to fire doors provided certain requirements are met. The cutout must be done

   in an authorized labeling shop. The products used i.e. glass, lite kit and glazing material are all

4  approved fire rated products. The size limitations of a lite is determined by the hourly rating and glass
   type used.
   1   2   3   4   5   6   7   8   9